JP2002315786A - Wheelchair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate an unstable fluctuation or the like of a hand handle disposed at an unused position due to a vibration or the like even when a wheelchair is, for example, mounted on a vehicle. SOLUTION: The wheelchair has a structure in which the hand handle 10 can be moved from a using position to the unused position to a wheelchair constituting member. The wheelchair is moved in cooperation with the movement of the handle 10. The wheelchair comprises an engaging member 20 having a first engaging part and a second engaging part, and a locking member 30 which is engaged with the first engaging part when the handle 10 is located at the using position and which is engaged with the second engaging part when the handle 10 is located at the unused position. Thus, when the handle 10 which is disposed at the using position, is moved to the unused position, the member 30 is engaged with the second engaging part, and hence the handle is locked to the wheelchair constituting member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wheelchair having a structure in which a push handle can be moved from a use position to a nonuse position with respect to a wheelchair component.

[0002]

2. Description of the Related Art A hand wheel for a wheelchair is generally provided so as to protrude rearward at an upper portion of the wheelchair so that a caregiver can easily push the wheelchair. However, when the wheelchair is not moved, for example, when the wheelchair is used as a chair in a stopped state, the hand push handle protruding backward becomes an obstacle. In order to improve this point, Japanese Patent Laid-Open No. 10-4324 discloses a wheelchair in which a grip of a push handle is rotatable between a use position and a nonuse position where the handle is projected rearward.
No. 4 (see FIG. 6). FIG.
(A) is a top view of the handwheel of the said wheelchair,
FIG. 6B is a plan sectional view thereof, and FIG. 6C is an overall plan view of the wheelchair.

As shown in FIGS. 6 (A) and 6 (B), a hand push handle 52 is fixed to a rear vertical frame 51 of a wheelchair 50 by a fixing bracket 53, and a rotating pin 56 is connected to the fixing bracket 53. Grip 54 mounted to be horizontally rotatable
And Between the grip 54 and the fixing bracket 53, a lock mechanism 60 for locking the grip 54 with respect to the fixing bracket 53 at a use position (a position where the grip 54 faces rearward) is provided. The lock mechanism 60 is held in a locked state by elastically fitting a tip end of a lock pin 64 attached to the grip 54 to a through hole 62 formed in the fixing bracket 53. In addition, the locked state of the lock mechanism 60 is released by pulling out the lock pin 64 of the grip 54 from the through hole 62 of the fixing bracket 53 against the elastic force by the lock release lever 66.
When the locked state is released, the grip 54 is rotatable in the horizontal direction from the use position to the width direction position (unused position) of the wheelchair 50 shown by the two-dot chain line.

[0004]

However, in the wheelchair 50 described above, the grip 54 of the push handle 52 is locked only in the use position. For this reason, for example, a wheelchair 50
When mounted on a vehicle, the grip 54 rotated to the non-use position may swing around the rotation pin 56 due to vibration or the like. When the grip 54 protrudes rearward of the wheelchair 50 due to the swing, the occupant positioned behind the wheelchair 50 may be disturbed. SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a wheelchair capable of preventing the push handle from swinging even when the push handle is in an unused position.

[0005]

The above-mentioned objects are attained by the present invention. The invention according to claim 1 is a wheelchair having a structure in which a handwheel can be moved from a use position to a nonuse position with respect to a wheelchair constituent member, and moves in conjunction with movement of the handwheel, and the first engagement portion And an engagement member having a second engagement portion and the wheelchair component member, wherein the push handle is engaged with the first engagement portion when the push handle is in a use position, and the push handle is not engaged. A lock member that engages with the second engagement portion when in the use position.

According to the present invention, when the push handle is in the use position, the push handle is locked to the wheelchair component by the engaging action between the lock member and the first engaging portion. Therefore, the caregiver can use the push handle to move the wheelchair. That is, the original use of the wheelchair becomes possible. When the lock member and the first engagement portion are disengaged from each other and the push handle in the use position is moved to the non-use position, the lock member engages with the second engagement portion, and the push handle is engaged. Is locked to the wheelchair component. For this reason, even if the wheelchair is mounted on a vehicle, for example, the handwheel at the non-use position does not swing unstably due to the influence of vibration or the like.

According to a second aspect of the present invention, there is provided the wheelchair according to the first aspect, wherein the engaging member rotates in conjunction with the movement of the push handle, and the lock member slides. And a first engaging portion and a second engaging portion are formed in a hole shape on the sliding surface. As described above, since the first engagement portion and the second engagement portion are formed in a hole shape on the sliding surface of the engagement member, the structure of the engagement member can be simplified. The hole shape includes notches as well as holes.

It is preferable that a biasing member is provided for biasing the lock member in a direction in which the lock member is engaged with the first engagement portion or the second engagement portion. Further, the engagement with the second engaging portion is released by rotating the push handle from the non-use position to the use position with a force greater than a predetermined force. You may comprise so that it may be. According to a fifth aspect of the present invention, if a stopper for restricting the rotation range of the push handle is provided, even if an operating force is applied to the push handle in a direction exceeding the rotation range, the locking member and the first engagement are prevented. No excessive force is applied to the portion or the second engaging portion.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) Hereinafter, FIGS.
The wheelchair according to the first embodiment of the present invention will be described based on FIG. In the present embodiment, the present invention is applied to a vehicle seat having a wheelchair function (hereinafter, referred to as a wheelchair seat). FIG. 1A is an exploded perspective view of a push handle portion of the wheelchair seat, and FIG. (B) shows an overall schematic perspective view of the wheelchair seat. FIGS. 2 to 4 are side views showing a procedure for rotating the push handle from a use position protruding rearward to an unused position where it is folded downward. The following description will be made with the width direction of the wheelchair seat as the X direction, the front-rear direction as the Y direction, and the height direction as the Z direction.

As shown in FIG. 1B, the wheelchair seat 1 includes a seat frame 4 and a front wheel 6 and a rear wheel 5 foldably mounted on the lower surface of the seat frame 4. A seat 2 including a seat cushion 2a and a seat back 2b is attached to the inside of the seat frame 4, and a pair of push handles 10, which will be described later, are mounted on the upper rear surface of the seat frame 4. The seat frame 4 is provided with a connection mechanism (not shown) for connecting the wheelchair seat 1 to an outdoor moving device (not shown) provided inside the vehicle.

In order to lower the wheelchair seat 1 from the interior of the vehicle to the outside, the outdoor moving device is driven to move the wheelchair seat 1 from the interior of the vehicle to a predetermined external position, and after the front wheel 6 and the rear wheel 5 are taken out, The connection between the wheelchair seat 1 and the outdoor moving device is released. In this state, the wheelchair seat 1 can be used as a wheelchair. In order to store the wheelchair seat 1 from the outside in the interior of the vehicle, on the contrary, after connecting the wheelchair seat 1 and the outdoor moving device, the front wheel 6 and the rear wheel 5 are folded, and the outdoor moving device is used. The wheelchair seat 1 is moved from the outside to a predetermined position in the room. Thus, the wheelchair seat 1 can be used as a vehicle seat.

Next, a structure for attaching the push handle 10 to the seat frame 4 will be described with reference to FIG. As shown in FIGS. 1A and 2A, the push handle 10 has a use position protruding rearward,
As shown in FIG. 4, it is a structure that can be turned up and down between a non-use position where it is folded down, and has a handle pipe 12 that is bent in a substantially L-shape. Handle pipe 1
2, a brake lever 14 and a grip 13 are attached to the tip side (right end side in FIG. 1) of the bent portion 12w. The operation force applied to the brake lever 14 is transmitted to a brake body (not shown) of the rear wheel 5 via a brake wire 14s.

A short cylindrical hinge drum 20 is fixed to the base end of the handle pipe 12 by, for example, welding. The hinge drum 20 is a member arranged at the center of rotation of the push handle 10, and includes a cylindrical portion 22, a beam member 24, and a central shaft 26. The cylindrical portion 22 is formed of, for example, steel or the like, and the base end of the handle pipe 12 is connected to the outer peripheral surface 22r of the cylindrical portion 22 from a substantially tangential direction. The cylindrical portion 22 is provided inside the cylindrical portion 22.
The beam member 24 is arranged in a diameter of
4 are fixed to the inner peripheral wall surface of the cylindrical portion 22 by welding or the like. The end of the beam member 24 on the handle pipe 12 side is referred to as an upper end H, and the end opposite to the upper end H is referred to as a lower end K.

The beam member 24 is, as shown in FIG.
When the beam member 24 is slightly inclined with respect to the vertical line N, that is, when the angle between the beam member 24 and the vertical line N is α °, the hinge is held so that the grip 13 is held in the use position. It is fixed to the cylindrical portion 22 of the drum 20.

As shown in FIG. 1A, a through hole 24k is formed at the center of the beam member 24, and the central axis 26 is inserted through the through hole 24k so as to be coaxial with the cylindrical portion 22. Have been. And the center axis 26 is the beam member 24.
Is fixed firmly by welding or the like. Center axis 2
6, connecting pins 26 p are formed so as to protrude coaxially with the center axis 26 thereof, and both connecting pins 26 p are formed on bearing portions 4 j formed on the fixing plate 4 u of the seat frame 4 and on the fixing plate 4 u. It is horizontally rotatably supported by a bearing 4j formed on the opposing holding plate 4p.

The cylindrical portion 22 of the hinge drum 20 has a structure shown in FIG.
2A, a substantially rectangular first opening 22a is formed near the lower end K of the beam member 24. As shown in FIG. A substantially rectangular second opening 2 is located at a position about 80 ° counterclockwise rotated about the axis of the cylindrical portion 22 from the first opening 22a.
2b is formed.

A lock cam 30 that engages with the first opening 22a or the second opening 22b formed in the hinge drum 20 is mounted on the fixing plate 4u of the seat frame 4. The lock cam 30 is a thick plate formed in a hook shape. As shown in FIG. 2B and the like, the lock cam 30 includes a cam body 32 and an engagement portion 34 formed in a hook shape at the tip of the cam body 32. Have. In the lock cam 30, an operation pin 35 is formed at a boundary between the cam body 32 and the engaging portion 34 so as to protrude on both sides in the thickness direction of the lock cam 30.

A through hole 32k is formed at the base end of the cam body 32 of the lock cam 30, and a pin 38p of a support pin 38 formed on the fixing plate 4u of the seat frame 4 is inserted into the through hole 32k. Is done. Support pin 38
Is formed at a right angle to the fixing plate 4u, and includes a large-diameter support portion 38s and a pin portion 38p inserted into the through hole 32k of the lock cam 30. Further, a narrow groove (not shown) into which the E-ring 39e is fitted is formed at the tip end of the pin 38p.

When the pin 38p of the support pin 38 is inserted into the through hole 32k of the lock cam 30, as shown in FIG. 1A, a washer 39w is passed through the tip of the pin 38p, and the pin 38p is further inserted. The E-ring 39e is fitted into the narrow groove. As a result, the lock cam 30 is attached to the support pin 38 so as to be vertically rotatable. Support pin 38
A coil spring 39b is disposed around the periphery of the lock cam 30. One end of the coil spring 39b is hung on an operation pin 35 projecting to the rear side (the fixed plate 4u side) of the lock cam 30. Also,
The other end of the coil spring 39b is hung on the first support 7a located below the support pin 38.

Since the coil spring 39b is urged in a direction to separate the operation pin 35 of the lock cam 30 from the first support 7a, the lock cam 30 receives a force in the left rotation direction (upward rotation direction) in the figure by the coil spring 39b. Hinge drum 20
Is always pressed against the outer peripheral surface 22r. Therefore, when the hinge drum 20 rotates left (upward rotation) or rightward (downward rotation), the lock cam 30 moves the hinge drum 20.
Relatively move along the outer peripheral surface 22r. When the engaging portion 34 of the lock cam 30 engages with the first opening 22a or the second opening 22b of the hinge drum 20, the rotation of the push handle 10 is restricted.

The operating pin 35 of the lock cam 30 is operated to rotate the lock cam 30 rightward (downward) about the support pin 38 against the force of the coil spring 39b. Joint 34 and first opening 22
a or the engagement with the second opening 22b can be released. That is, the hinge drum 20 corresponds to the engaging member of the present invention, and the outer peripheral surface 22r of the hinge drum 20 corresponds to the sliding surface of the present invention. Further, the lock cam 30 corresponds to a lock member of the present invention, and the coil spring 39b corresponds to a biasing member of the present invention.

First pillar 7 on which coil spring 39b is hung
a is a column for connecting the fixing plate 4u and the holding plate 4p of the seat frame 4, and the length thereof is set to a value substantially equal to the axial size of the hinge drum 20. A female screw 7w into which the bolt 8 is screwed in the axial direction is formed at the tip of the first support 7a. A second support 7b (at a position slightly lower than the first support 7a) is fixed to the fixing plate 4u of the seat frame 4 substantially in line with the first support 7a, and a third support 7b is provided above both the support 7a and 7b. Prop 7c
And the fourth column 7d are fixed. The second column 7b to the fourth column 7d are columns for connecting the fixing plate 4u and the holding plate 4p together with the first column 7a, and the length thereof is set to a value equal to the dimension of the first column 7a. ing.

The third column 7c and the fourth column 7d have a function as a connecting member between the fixing plate 4u and the holding plate 4p as described above, and also function as a rotation stopper of the push handle 10. The third support 7c is passed through the lower inner space of the hinge drum 20, and the fourth support 7d is passed through the upper inner space of the hinge drum 20. And
The hinge drum 20 is provided between the third support 7c and the fourth support 7d.
Is rotated in accordance with the rotation of the hinge drum 20.

When the hinge drum 20 turns left (the push handle 10 turns upward), the lock cam 30 relatively moves along the outer peripheral surface 22r of the hinge drum 20, and the grip 13 of the push handle 10 is used. When it reaches the position, as shown in FIG.
Side abuts against the side surface of the fourth column 7d, and the side surface of the lower end K of the beam member 24 abuts against the third column 7c. In this state,
The left rotation of the push handle 10 is stopped, and the beam member 24 is stopped.
And the vertical line and the vertical line become α °, and the engaging portion 34 of the lock cam 30
a.

As shown in FIG. 2B, the lock cam 30 has a first opening 34a so that the distal end surface 34f of the engaging portion 34 contacts the opening edge 22e of the first opening 22a and the side surface of the beam member 24. Due to the engagement with the lock cam 30 and the opening edge 22e of the first opening 22a, the right rotation (downward rotation) of the hand push handle 10 is stopped. For this reason, the push handle 10 is locked in the use position. That is, the opening edge 22e of the first opening 22a of the hinge drum 20 corresponds to the first engaging portion of the engaging member of the present invention.

The engaging portion 34 of the lock cam 30 is
5, the hinge drum 2 is removed from the first opening 22a.
0 rotates to the right (the push handle 10 rotates downward), and the lock cam 30 also moves the outer peripheral surface 22 r of the hinge drum 20.
Move relatively along. And the hinge drum 20
When the grip 13 of the push handle 10 reaches the non-use position as shown in FIG. 4 (A), the side surface near the upper end H of the beam member 24 becomes the third support 7c. The side surface near the lower end K of the beam member 24 comes into contact with the fourth side column 7d. Thereby, the push handle 1
0 is stopped, and the engagement portion 34 of the lock cam 30 is engaged with the second opening 22 b of the hinge drum 20.

As shown in FIG. 4B, the lock cam 30 engages with the second opening 22b such that the hook surface 34x of the engaging portion 34 engages the opening edge 22j of the second opening 22b. The upward rotation of the hand push handle 10 is stopped by the function of the lock cam 30 and the opening edge 22j of the second opening 22b. As a result, the push handle 10 is locked in the unused position. That is, the opening edge 22j of the second opening 22b of the hinge drum 20 corresponds to the second engaging portion of the engaging member of the present invention. In addition, the third support 7c, the fourth support 7d, and the beam member 24 of the hinge drum 20 correspond to the restricting means of the present invention.

The holding plate 4p of the seat frame 4 is shown in FIG.
As shown in (A), a bolt hole 8h through which the bolt 8 is passed is formed at a position corresponding to the first column 7a to the fourth column 7d, and the bolt hole 8h is formed at a position corresponding to the operation pin 35 of the lock cam 30. An elongated hole 35h through which the operation pin 35 passes is formed.

Next, an example of a procedure for assembling the push handle 10 to the seat frame 4 will be briefly described. First, with the coil spring 39b set on the support pin 38, the lock cam 3 is attached to the pin portion 38p of the support pin 38.
0 is rotatably mounted. In this state, as described above, one end of the coil spring 39b is hooked on the operating pin 35 projecting from the back side of the lock cam 30, and the other end is connected to the first support 7a.
Multiplied by As a result, the lock cam 30 always receives a force in the upward rotation direction (left rotation direction in the figure) by the coil spring 39b.

Next, one connecting pin 26p formed on the hinge drum 20 of the push handle 10 is fitted into the bearing 4j of the fixed plate 4u of the seat frame 4,
Further, the other connecting pin 26p is connected to the bearing portion 4 of the holding plate 4p.
j. Further, the operation pin 35 protruding to the front side of the lock cam 30 is passed through the elongated hole 35h of the holding plate 4p,
Further, the bolt holes 8h of the holding plate 4p are aligned with the female screws 7w of the first to fourth columns 7a to 7d formed in the fixing plate 4u. In this state, the bolt 8 is inserted into the female screw 7w of the first column 7a to the fourth column 7d through the bolt hole 8h of the holding plate 4p.
Is screwed, the push handle 10 is vertically rotatably mounted on the seat frame 4 via the hinge drum 20, the fixing plate 4u, the pressing plate 4p and the like. That is, the seat frame 4 corresponds to a wheelchair constituent member of the present invention.

Next, the operation of the push handle 10 will be described. As shown in FIG. 2 (A), when the push handle 10 is in the use position, as described above, the hinge drum 2
0, the side surface of the upper end H of the beam member 24 is the fourth support 7d.
, And the side surface of the lower end portion K of the beam member 24 abuts the third support 7c, whereby the left rotation (upward rotation) of the push handle 10 is regulated. For this reason, even if a large lifting force is applied to the grip 13 of the push handle 10 in order for the caregiver to lift the wheelchair 1, there is no inconvenience that the push handle 10 rotates upward by the pulling force.

As shown in FIG. 2 (B), the distal end surface 34f of the engaging portion 34 of the lock cam 30 has the opening edge 22e of the first opening 22a of the hinge drum 20 and the beam member 2 as shown in FIG.
4, the downward rotation (rotation to the right) of the push handle 10 is stopped by the distal end surface 34 f of the lock cam 30 and the opening edge 22 e of the first opening 22 a of the hinge drum 20. Therefore, even if the caregiver applies a pressing force to the grip 13 of the push handle 10, there is no inconvenience that the push handle 10 rotates downward by the pushing force. That is, the push handle 10
Is locked in the use position, and the wheelchair seat 1 can be used favorably as a wheelchair.

When the push handle 10 is moved to the non-use position, the lock pin 30 is moved by the operation pin 35.
Is pressed down against the spring force of the coil spring 39b, and the engagement between the engaging portion 34 of the lock cam 30 and the first opening 22a of the hinge drum 20 is released. In this state, the push handle 10 can rotate downward. When the push handle 10 is pivoting downward, as shown in FIGS. 3A and 3B, the engaging portion 34 of the lock cam 30 engages the coil spring 39b.
Is pressed against the outer peripheral surface 22r of the hinge drum 20, and in this state, the outer peripheral surface 22r of the hinge drum 20 is pressed.
Move relatively along.

Then, the push handle 10 rotates downward by about 80 degrees from the use position, and as shown in FIGS. 4A and 4B, the upper end H of the beam member 24 in the hinge drum 20.
The nearby side surface abuts against the side surface of the third column 7c, and the beam member 24
When the side surface near the lower end portion K abuts on the fourth support 7d, the downward rotation of the hand push handle 10 is stopped. Further, the engaging portion 34 of the lock cam 30 relatively moving along the outer peripheral surface 22r of the hinge drum 20 automatically engages with the second opening 22b of the hinge drum 20 by the spring force of the coil spring 39b. Thereby, the engagement portion 34 of the lock cam 30
At the opening edge 22j of the second opening 22b, the upward rotation of the push handle 10 is restricted. That is, the push handle 10 is locked in the non-use position, and when the wheelchair seat 1 is used as a vehicle seat, the push handle 10 may not swing erratically due to the vibration of the vehicle or the like. Absent.

When the push handle 10 is moved from the non-use position to the use position, the lock cam 30 is pushed down by the operation pin 35 against the spring force of the coil spring 39b, and the engagement portion 34 of the lock cam 30 and the hinge drum 20 are moved. Is disengaged from the second opening 22b. In this state, the push handle 10 can be turned upward, and in a state where the push handle 10 is turned upward, FIG.
As shown in (B), the engaging portion 34 of the lock cam 30 relatively moves along the outer peripheral surface 22r of the hinge drum 20.

Then, the push handle 10 is turned upward by about 80 ° from the non-use position, and the side surface of the upper end portion H of the beam member 24 in the hinge drum 20, as shown in FIGS. Abuts on the side surface of the fourth support 7c and the side surface of the lower end K of the beam member 24 abuts on the third support 7d, the upward rotation of the hand push handle 10 is stopped. Also, the engaging portion 34 of the lock cam 30 relatively moving along the outer peripheral surface 22r of the hinge drum 20 automatically engages with the first opening 22a of the hinge drum 20 by the spring force of the coil spring 39b, The downward rotation of the push handle 10 is restricted.

As described above, according to the wheelchair seat 1 of the present embodiment, when the push handle 10 is rotated to the non-use position, the push handle is constituted by the lock cam 30 and the first opening 22 a of the hinge drum 20. Locked to the member. For this reason, even if the wheelchair is mounted on a vehicle, for example, the handwheel at the non-use position does not swing unstably due to the influence of vibration or the like.

The hinge drum 20 is structured to rotate in conjunction with the turning operation of the hand push handle 10, and has an outer peripheral surface 22r on which the lock cam 30 slides, and the lock cam 30 is engaged with the outer peripheral surface 22r. First opening 22a
And a second opening 22b. For this reason, the structure of the hinge drum 20 can be simplified.

Further, since the regulating means (third support 7c, fourth support 7d) for regulating the vertical rotation range of the push handle 10 is provided, the push handle 10 is moved in a direction exceeding the rotation range with respect to the push handle 10. Even if an operating force is applied, no excessive force is applied to the hinge drum 20, the lock cam 30, and the like.

In the hand push handle 10 according to the first embodiment, the lock cam 30 is formed in a hook shape. However, as shown in FIGS. 5A and 5B, the hook surface 44x of the lock cam 40 is changed. It may be formed with a gentle inclination. With this configuration, the hand push handle 10 is pulled upward at a non-use position by a force equal to or greater than the spring force of the coil spring 39b.
The opening edge 22j of the second opening 22b of the hinge drum 20 moves while pressing the hook surface 44x of the lock cam 40, and the engagement between the lock cam 40 and the hinge drum 20 is automatically released. Therefore, the operation of pushing down the lock cam 40 by the operation pin 35 at the unused position is not required.

In the first embodiment, the example in which the present invention is applied to the wheelchair seat 1 having both the function of the wheelchair and the function of the vehicle seat is shown. However, the present invention is applied to a general wheelchair. Is also possible. In the first embodiment, the hand push handle 10 having a structure that rotates vertically with respect to the seat frame 4 has been described. However, the present invention can be applied to a hand push handle that rotates horizontally. Further, in the first embodiment, the example in which the lock cam 30 is made to follow the outer peripheral surface 22r of the cylindrical portion 22 of the hinge drum 20 has been described. It is also possible to have the lock cam 30 along the surface.

[0042]

According to the present invention, even if the wheelchair is mounted on a vehicle, for example, the handwheel does not swing unsteadily due to the influence of vibration, etc., and the occupant whose handwheel is located behind the wheelchair. It does not get in the way.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view (FIG. 1A) of a push handle portion of a wheelchair seat according to a first embodiment of the present invention (FIG. 1A), and an overall schematic perspective view of a wheelchair seat (FIG. 1B).

FIG. 2 is a side view (A) showing a procedure of rotating a push handle from a use position to a non-use position, and a side view (B) showing an operation of a lock cam.

FIGS. 3A and 3B are a side view showing a procedure for rotating a push handle from a use position to a non-use position (FIG. A) and a side view showing an operation of a lock cam (FIG. B).

FIG. 4 is a side view (A) showing a procedure for rotating the push handle from a use position to a non-use position, and a side view (B) showing the operation of a lock cam.

FIG. 5 is a side view (A) showing a modified example of the push handle portion of the wheelchair seat, and a side view (B) showing the operation of the lock cam.

FIG. 6 is a plan view (FIG. A) of a conventional push handle portion,
It is a plane sectional view (Drawing B) and an overall plan view (Drawing C) of a wheelchair.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wheelchair seat 4 Seat frame (wheelchair constituent member) 4u Fixing plate 4p Holding plate 7c Third support (restriction means) 7d Fourth support (restriction means) 10 Push handle 20 Hinge drum (engagement member) 22r Outer peripheral surface (sliding) Moving surface) 22a First opening 22e Opening edge (first engaging portion) 22b Second opening 22j Opening edge (second engaging portion) 24 Beam member (restriction means) 30 Lock cam (locking member) 34 Engaging portion 39b Coil spring (Biasing member)

Claims (5)

[Claims] 1. A wheelchair having a structure in which a push handle can be moved from a use position to a non-use position with respect to a wheelchair constituent member, wherein the wheelchair moves in conjunction with the movement of the push handle, and moves between the first engagement portion and the first engagement portion. An engagement member having two engagement portions, and being coupled to the wheelchair component, engaging with the first engagement portion when the push handle is in a use position,
A lock member that engages with the second engagement portion when the push handle is in an unused position. 2. The wheelchair according to claim 1, wherein the engagement member has a structure that rotates in conjunction with the movement of the push handle, and has a sliding surface on which the lock member slides, A wheelchair, wherein a first engagement portion and a second engagement portion are formed in a hole-like shape on the sliding surface. 3. The wheelchair according to claim 1, wherein the urging member urges the lock member in a direction in which the lock member is engaged with the first engagement portion or the second engagement portion. A wheelchair, comprising: 4. The wheelchair according to claim 1, wherein the lock member rotates the push handle from the unused position to the used position with a force greater than a predetermined force. A wheelchair, which is configured to be disengaged from the second engagement portion when operated. 5. The wheelchair according to claim 1, further comprising a regulating means for regulating a rotation range of the push handle.